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Exploration of the Genetic Basis of Taro Leaf Blight Resistance in Breeding Populations

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Exploration of the Genetic Basis of Taro Leaf Blight Resistance in Breeding Populations EXPLORATION OF THE GENETIC BASIS OF TARO LEAF BLIGHT RESISTANCE IN BREEDING POPULATIONS A THESIS SUBMITTED TO THE GRADUATE DIVISION OF THE UNIVERSITY OF HAWAIʻI AT MĀNOA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE IN TROPICAL PLANT AND SOIL SCIENCES June 2018 By Roshan Paudel Thesis Committee: Michael B. Kantar, Chairperson Susan C. Miyasaka Michael Shintaku Richard Manshardt Keywords: Quantitative trait loci, Taro Leaf Blight, Taro breeding. © Copyright Roshan Paudel ACKNOWLEDGEMENTS I am very grateful to my thesis advisor, Dr. Michael Kantar, for his incredible guidance and support throughout my thesis research. I would like to thank Dr. Susan Miyasaka for all the academic and financial support she has given me during my masters’ studies. I would like to extend my thanks to my committee members, Dr. Michael Shintaku and Dr. Richard Manshardt, for their thoughts and comments on the thesis. My special appreciation goes to Christopher ‘Popo’ Bernabe who trained me on taro cross-pollination and Steven Starnes who trained me on laboratory assay. Special thanks to Dr. James Keach and Joanne Lichty for the statistical help. My parents always encouraged and inspired me to continue my academic pursuits. I am forever indebted to them. Finally, thank you friends and family! 1 ABSTRACT Taro (Colocasia esculenta) is a clonally propagated root crop that is a staple of Pacific Islanders. Production of taro is reduced by the Taro Leaf Blight (TLB) disease that is present in most of the taro growing regions of the world. Genetic resistance has been identified in taro populations from Palau, Indonesia and Papua New Guinea. In this study, I explore the genetic architecture of TLB resistance in three breeding populations with the resistant material being incorporated into the existing University of Hawaii taro breeding program. A linkage map based on a F1 population using single nucleotide polymorphism (SNP) markers was developed to identify quantitative trait loci (QTL) linked with TLB resistance in laboratory assays. Sixteen QTL with major and minor effects were identified on different linkage groups. In addition to the mapping populations, 295 genotypes of taro were evaluated for yield attributes using a Hierarchical Bayesian Model. Yield data were collected for six years from 2013 to 2018, with the breeding cultivar 1025-181 being most promising in terms of yield. The QTL identified in this study can be used in Marker Assisted Selection (MAS) of taro for TLB resistance. The promising genotypes for yield and TLB resistance should be included as parents in future breeding programs. 2 TABLE OF CONTENTS ACKNOWLEDGEMENTS ............................................................................................................ 1 ABSTRACT .................................................................................................................................... 2 LIST OF TABLES .......................................................................................................................... 6 LIST OF FIGURES ........................................................................................................................ 7 CHAPTER 1: THE HISTORY OF TARO (COLOCASIA ESCULENTA L.) .............................. 9 Introduction ................................................................................................................................. 9 Botanical Description .................................................................................................................. 9 Taro Genetics ............................................................................................................................ 10 Uses ........................................................................................................................................... 10 History of Hawaiian Taro .......................................................................................................... 11 Taro production ......................................................................................................................... 11 Worldwide taro production .................................................................................................... 11 Taro production in Hawaii ..................................................................................................... 12 Taro Leaf Blight (TLB) – The most important biotic stress for Taro ....................................... 12 Taro Breeding ............................................................................................................................ 13 Rationale for thesis research ..................................................................................................... 14 References ................................................................................................................................. 16 Tables and figures ..................................................................................................................... 20 CHAPTER 2: QTL MAPPING FOR TLB TOLERANCE/RESISTANCE ................................. 25 Abstract ..................................................................................................................................... 25 Introduction ............................................................................................................................... 26 Materials and Methods .............................................................................................................. 29 Development of Mapping Population and Disease Phenotyping .......................................... 29 DNA extraction and genotyping ............................................................................................ 32 Linkage mapping ................................................................................................................... 33 Genotype Imputation ............................................................................................................. 33 QTL analysis.......................................................................................................................... 34 Results ....................................................................................................................................... 35 F1 Population-1025s .............................................................................................................. 35 Phenotype scores ................................................................................................................ 35 3 Linkage mapping and QTL analysis .................................................................................. 35 Isolate S1 ........................................................................................................................ 36 Isolate S3 ........................................................................................................................ 36 F2 Population-1063s .............................................................................................................. 37 Phenotype scores ................................................................................................................ 37 F2 population -1060s ............................................................................................................. 37 Phenotype scores ................................................................................................................ 37 Linkage mapping of the F2 populations ................................................................................ 38 Discussion ................................................................................................................................. 38 Conclusions ............................................................................................................................... 41 References ................................................................................................................................. 43 Tables and figures ..................................................................................................................... 47 Table 2-1 Basic statistics of phenotypic data in the F1 mapping population 1025 ............... 65 CHAPTER 3: EVALUATION OF SEGREGATING TARO PROGENIES FOR YIELD ......... 68 Abstract ..................................................................................................................................... 68 Introduction ............................................................................................................................... 69 Materials and Methods .............................................................................................................. 71 Multiple Comparison with the Best (MCB) .......................................................................... 72 Exploring the data in Bayesian Context ................................................................................ 72 Results ....................................................................................................................................... 75 MCB ...................................................................................................................................... 75 Bayesian Modeling of Yield components ............................................................................. 75 Within year variation in genotypes for yield ....................................................................
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